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The effect of frequency compression and high-frequency directionality on horizontal localisation and speech in noise rec

ASA meeting May 2010, Sydney. The effect of frequency compression and high-frequency directionality on horizontal localisation and speech in noise recognition. Ingrid Yeend, Anna O’Brien, Lisa Hartley, Gitte Keidser and Myriel Nyffeler* National Acoustic Laboratories *Phonak AG.

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The effect of frequency compression and high-frequency directionality on horizontal localisation and speech in noise rec

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  1. ASA meeting May 2010, Sydney The effect of frequency compression and high-frequency directionality on horizontal localisation and speech in noise recognition Ingrid Yeend, Anna O’Brien, Lisa Hartley, Gitte Keidser and Myriel Nyffeler* National Acoustic Laboratories *Phonak AG

  2. IntroductionWhat is frequency compression? • Compression of a range of input frequencies into a smaller output range • Permanent Source: Nyffeler, 2008

  3. IntroductionWhat is high frequency directionality? Source: Phonak Directionalityapplied to the high-frequencies that is designed to provide changes in spectral shape with azimuth

  4. Objective • To investigate the effect of frequency compression, high frequency directionality, and the combination of the two on horizontal localisation and speech recognition in noise.

  5. Method 23 experienced hearing aid users Naida V SP matched to NAL-NL1 targets (-3dB if 3FA < 60dB HL)

  6. Method Objective tests: horizontal localisation (pink noise, cockatoos) speech recognition in noise Subjective tests: Speech, Spatial & Qualities of Hearing (SSQ) questionnaire exit interview

  7. Results – objective tests • Horizontal localisation high frequency directionality reduced F-B RMS errors by average 4.5 ̊ xno significant effect of time xno significant interactions involving frequency compression, microphone mode or time.

  8. Results – objective tests • Speech recognition in noise high frequency directionality provided spatial release from masking Xno other significant interactions

  9. Results – subjective feedback high degree participant satisfaction with device X no significant difference on SSQ for FC on vs FC off. Xno significant interaction between FC and microphone mode on exit interview

  10. Conclusions • Horizontal localisation - front-back localisation cues less useable because spectrally compressed - mid-frequency (~1.3 - 2.5 kHz) information may have replaced high frequency cues • Speech recognition in noise - excessive or insufficient audibility - speech test too difficult - NAL-NL1 gives < HF gain than prescription methods used in some other research and may have affected audibility

  11. Clinical Implications and future research • Clinical implications - FC neither harms nor helps front-back discrimination, speech recognition in noise or satisfaction with amplification - choose high frequency directionality where possible • Future research - Effect of prescribed gain? - Is cognitive loading in challenging listening situations eased by FC? - Longer adaptation period (adults)?

  12. Acknowledgements from the National Acoustic Laboratories Harvey Dillon, Dan Zhou from Phonak AG Ora Buerkli, Cleon Davey, Stefan Launer from University of Melbourne Hugh McDermott

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